The present invention relates to azomethine-type direct dyes with a tri-aromatic unit having the following formula (I) : and their use for colouring keratin fibres, particularly human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres comprising, in a suitable medium for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibres using said dyeing composition. Finally the present invention also relates to precursors for these direct dyes.
本发明涉及具有以下公式(I)的三芳基单元的偶氮甲基型
直接染料,以及它们用于染色角蛋白纤维,特别是人类角蛋白纤维如头发。本发明还涉及一种用于染色角蛋白纤维的组合物,其中包含适用于染色的
直接染料和适当的介质。本发明的另一个主题是使用所述
染料组合物染色角蛋白纤维的方法。最后,本发明还涉及这些
直接染料的前体。